TiO2-modified MALDI target for in vitro modeling of the oxidative biotransformation of diclofenac
Alexander Yu. Gorbunov, К. А. Краснов, Alexander A. Bardin, Olga A. Keltsieva, Vladimir Babakov, Е. P. Podolskaya
Abstract
The UV-induced photocatalytic oxidation in the presence of TiO2 nanoparticles (UV/TiO2-PCO) is a more adequate approach than electrochemical oxidation to simulate the oxidative metabolism of diclofenac based on the comparative analysis of oxidation products using high-resolution tandem mass spectrometry. A simple and fast high-throughput technique is proposed for modeling the oxidative metabolism, which involves UV/TiO2-PCO performed directly on a MALDI target and subsequent analysis by matrix-assisted laser desorption/ionization mass spectrometry. The ranges and yields of diclofenac oxidation products obtained by the conventional bulk UV/TiO2-PCO and the proposed on-target version are in excellent agreement.